A rock at rest has weight 138 N....

Physics
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3. A rock at rest has weight 138 N. What is the weight of the rock when it is accelerating upward at 12 m/s2?

4. An astronaut's pack weighs 17.5 N when she is on earth, but only 3.24 N when she is on the surface of an asteroid. What is the acceleration due to gravity on this asteroid?

5. A large sphere has a mass of 175 kg and is suspended by a chain from the ceiling. The mass of the chain is 12.0 kg. What is the tension in the chain?

May 18th, 2015

1.What does a 138N rock weigh if it is accelerating 
a)upward at 12 m/s^2 
138N rock has a mass of 138/9.8 = 14.1 kg 
F=ma 
f = 14.1 kg x 12 m/s² = 169 N 
upwards, so the forces add, and net is 138+169 = 307 N 

2=Best Answer:18=m9.81 
m=1.835kg 
3.49=1.835a 
a=1.902m/s^2 

mass of pack = 1.835kg 


May 18th, 2015

last one is not asking for the mass is asking for the Force  N 

May 18th, 2015

sorry sir i dont understand fully plz elaborate....which one you are talking about

May 18th, 2015

is asking for the tension of the chain. in N 

May 18th, 2015

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May 18th, 2015
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